class_docstr: Base class for all other trainer classes.
  
  :param boolean show_training_progress: Show progress indicators for the
         trainer. The environment variable ``CHATTERBOT_SHOW_TRAINING_PROGRESS``
         can also be set to control this. ``show_training_progress`` will override
         the environment variable if it is set.
docstr: Preprocess the input statement.
docstr_tok: ["Preprocess","the","input","statement","."]
code: def get_preprocessed_statement(self, input_statement):
      """
      Preprocess the input statement.
      """
      for preprocessor in self.chatbot.preprocessors:
          input_statement = preprocessor(input_statement)
  
      return input_statement
  
imports: import os
  import sys
  import csv
  import time
  from dateutil import parser
  from chatterbot.conversation import Statement
  from chatterbot.tagging import PosLemmaTagger
  from chatterbot import utils
label_desc: Use image node_id 2 for calling the Trainer obj's underlying member method code with example usage: obj.get_preprocessed_statement(input_statement) and returns: input_statement